[ovirt-users] Two ovirt-engine manage one hypervisor

[Yaniv Kaul]

On Thu, Jun 16, 2016 at 9:29 AM, Yedidyah Bar David <didi at redhat.com> wrote:

> On Thu, Jun 16, 2016 at 9:10 AM, Yaniv Kaul <ykaul at redhat.com> wrote:
> >
> >
> > On Thu, Jun 16, 2016 at 8:53 AM, Yedidyah Bar David <didi at redhat.com>
> wrote:
> >>
> >> On Thu, Jun 16, 2016 at 5:33 AM, Sandvik Agustin
> >> <agustinsandvik at gmail.com> wrote:
> >> > Hi users,
> >> >
> >> > Good day, is it possible to configure two ovirt-engine to manage one
> >> > hypervisor? My purpose for this is what if the first ovirt-engine
> fails,
> >> > I
> >> > still have the 2nd ovirt-engine to manage hypervisor.
> >> >
> >> > is this possible? or any suggestion similar to my purpose?
> >>
> >> The "normal" solution is hosted-engine, which has HA - the engine
> >> runs in a VM, and HA daemons monitor it and the hosts, and if there
> >> is a problem they can start it on another host.
> >>
> >> There were discussions in the past, which you can find in the list
> >> archives,
> >> about running two engines against a single database, and current bottom
> >> line
> >> is that it's not supported, will not work, and iiuc will require some
> >> significant development investment to support.
> >>
> >> You might manage to have an active/passive solution - install an engine
> >> on two machines, configure both to use the same remote database, but
> >> make sure only one of them is active at any given time. Not sure if
> that's
> >> considered "fully supported", but might come close.
> >
> >
> > That's not enough - they need to share the same set of certificates...
>
> Best is to simply clone the machine after initial setup then change
> what's needed, or backup/restore only files (engine-backup --mode=backup
> --scope=files).
>
> Didn't check, but I do not think they actually need all the certs of
> all hosts - that is, that it's not mandatory to keep /etc/pki synced
> between them after initial setup. Didn't try that myself.
>

I'm not sure what happens when you provision a host from Mgmt A, then move
to Mgmt B and provision another from it:
1. Mgmt A won't be aware of that host, from cert req perspective. May not
be such a big deal - donno.
2. Can Mgmt A provision another host? Need to ensure the certificate serial
numbers are OK, etc.

They really need to share the CA DB.
The backup-restore sounds like good approach  to me.
Y.


> > Y.
> >
> >>
> >>
> >> You can find on the net docs/resources about creating a redundant
> >> postgresql cluster.
> >>
> >> Best,
> >> --
> >> Didi
> >> _______________________________________________
> >> Users mailing list
> >> Users at ovirt.org
> >> http://lists.ovirt.org/mailman/listinfo/users
> >
> >
>
>
>
> --
> Didi
>
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